381663541 has 8 divisors (see below), whose sum is σ = 455151744. Its totient is φ = 312916560.

The previous prime is 381663539. The next prime is 381663589. The reversal of 381663541 is 145366183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381663541 - 2¹ = 381663539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 381663541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381663521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1185130 + ... + 1185451.

It is an arithmetic number, because the mean of its divisors is an integer number (56893968).

Almost surely, 2^381663541 is an apocalyptic number.

It is an amenable number.

381663541 is a deficient number, since it is larger than the sum of its proper divisors (73488203).

381663541 is a wasteful number, since it uses less digits than its factorization.

381663541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370611.

The product of its digits is 51840, while the sum is 37.

The square root of 381663541 is about 19536.2110195401. The cubic root of 381663541 is about 725.3710607890.

The spelling of 381663541 in words is "three hundred eighty-one million, six hundred sixty-three thousand, five hundred forty-one".